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Fix: fix python readMessageBegin return value type error #1227

Job	Run time
compiler (ubuntu-20.04)	2m 46s
compiler (ubuntu-22.04)	2m 10s
lib-go (1.20)	2m 1s
lib-go (1.21)	1m 51s
lib-java-kotlin	5m 23s
lib-rust	5m 18s
lib-python (3.x)	1m 22s
lib-swift	1m 29s
cross-test (java, java,kotlin)	1m 34s
cross-test (java, go,rs)	1m 21s
cross-test (java, swift)	46s
cross-test (kotlin, java,kotlin)	50s
cross-test (kotlin, go,rs)	33s
cross-test (kotlin, swift)	32s
cross-test (go, java,kotlin)	1m 11s
cross-test (go, go,rs)	1m 11s
cross-test (go, swift)	31s
cross-test (rs, java,kotlin)	1m 8s
cross-test (rs, go,rs)	47s
cross-test (rs, swift)	52s
cross-test (swift, java,kotlin)	33s
cross-test (swift, go,rs)	1m 38s
cross-test (swift, swift)	55s
	36m 42s

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